Reference Manual
00809-0100-4799, Rev BA
September 2002
Model 3244MV
2-9
Sensor Connections
The Model 3244MV transmitter is compatible with many RTD and
thermocouple sensor types. Figure 2-8 shows the correct sensor terminal
input connections on the transmitter. To ensure an adequate sensor
connection, anchor the sensor lead wires beneath the flat washer on the
terminal screw.
If the sensor is installed in a high voltage environment and a fault condition or
installation error occurs, the sensor leads and transmitter terminals could
carry lethal voltages. Use extreme caution when making contact with the
leads and terminals.
RTD or Ohm Inputs
Various RTD configurations, including 2-wire, 3-wire, 4-wire, and
compensation loop designs, are used in industrial applications. If the
transmitter is mounted remotely from a 3- or 4-wire RTD, it will operate within
specifications, without recalibration, for lead wire resistances of up to 10 ohms
per lead (equivalent to 1,000 feet of 20 AWG wire). In this case, the leads
between the RTD and transmitter should be shielded. If using only two leads
(or a compensation loop lead wire configuration), both RTD leads are in
series with the sensor element, so significant errors can occur if the lead
lengths exceed one foot of 20 AWG wire.
Thermocouple or Millivolt Inputs
For direct-mount applications, connect the thermocouple directly to the
transmitter. If mounting the transmitter remotely from the sensor, use
appropriate thermocouple extension wire. Make connections for millivolt
inputs with copper wire. Use shielding for long runs of wire.
NOTE
The use of two grounded thermocouples with a Model 3244MV is not
recommended. For applications in which the use of two thermocouples is
desired, connect either two ungrounded thermocouples, one grounded and
one ungrounded thermocouple, or one dual element thermocouple.
Figure 2-8. Transmitter Sensor
Wiring.
* The transmitter must be configured for a 3-wire RTD in order to recognize an RTD with a
compensation loop.
T/Hot
Backup/Dual
Sensor with 2
RTDs
2-wire RTD
and Ohms
3-wire RTD
and Ohms
4-wire RTD
and Ohms
Thermocouples
and Millivolts
T/Hot
Backup/Dual
Sensor with 2
TCs
T/Hot
Backup/Dual
Sensor with
RTD/TC
T/Hot
Backup/Dual
Sensor with
TC/RTD
RTD with
Compensation
Loop*
T/Hot
Backup/Dual
Sensor with 2
RTDs with
Compensation
Loop
31
44-
0
000F05
A
Summary of Contents for 3244MV
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